Use two comps. Each comp will be one "Row of images"
1) Top Row Comp: Apply Autoscroll. Leave speed positive number
2) Bottom Row Comp: Apply Autoscroll. Change speed to negative number.
The number of the speed will vary depending on how many pixels you want to move those images in 30 seconds
Thanks....it worked perfectly. How would I apply a feathered edge to it?
Precompose and use a feathered mask on the precomp (or the Linear Wipe effect).